Interference filter and method of making the same

Details Interference filter and method of making the same Interference filter and method of making the same

G - Physics

02

B

G02B 5/28 (2006.01) G02B 5/20 (2006.01)

Patent

CA 2113794

A multiple layer film 3 is composed on a substrate 2 by evaporation. The multiple layer film 3 is composed of a lower multiple layer film 31, a cavity layer 32, and an upper multiple layer film 33. The upper and lower layer films 31, 33 are composed by alternately laminating high refractive film layers 31H, 33H, and low refractive film layers 31L, 33L, respectively. In the x-axis direction of the substrate 2, the wavelength .lambda., that is, the film thickness is changed continuously so that all wavelengths may be .lambda./4n (n being the refractive index) with the film thickness corresponding to the transmission wavelength A. Thus, the selective wavelength is changed continuously depending on the incident position of the light.

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